ISSUE-005 — Implement Feature Add-ons (Payments, CMS, i18n)

[ISONIC0788]

What to build

Expand the module extension catalog within the add context by creating the underlying functional blocks for payment checkouts (Stripe), headless content modules (Contentlayer), and localization tools (next-intl).

Files to modify

• src/commands/add.js
• Create src/plugins/payments.js
• Create src/plugins/cms.js
• Create src/plugins/i18n.js

Specs

• Reference section 3.3 (add command listings).

Acceptance criteria

• Implement code blueprints for payments utilizing Stripe elements.
• Implement cms plugin architectures using static content parsers.
• Implement comprehensive globalization configuration via i18n.
• Ensure correct structural alignment and package merging into the destination workspace config.

Dependencies

• ISSUE-004